1C (Smoking causes lung cancer, which is the number one cancer among men)

2D (Smoking is also the leading cause of mouth cancer, tounger cancer, and throat cancer.)

3C (Smoking causes one million early deaths in the world every year)

4B (leading: hàng đầu ≈ main: chủ yếu)

5B (Children whose parents smoke ... to non-smokers)

=>
1. C ( smoking causes lung cancer, which is the number one cancer among men)
2. D ( smoking is also the leading cause of mouth cancer, tongue cancer, and throat cancer.)
3. C ( smoking causes one million early deaths)
4. B main ( leading : dẫn đầu, main : chính)
5. B ( Children whose parents smoke have more breathing and lung problems than other chilren. Women who are...non-smokers.)